樹莓派zero本身板子上有一個mini HDMI，但是我看到好像板子上還有一個小接口，上面寫著TV，感覺應(yīng)該可以輸出AV信號，于是網(wǎng)上搜索了一番，果然可以。

首先，手工做了一根線，將一個視頻接口變成兩個小接口；

然后，再樹莓派上焊上插針；

最后，將接口連接起來，注意信號線和接地線，不要反了。

樹莓派的TV插座上，底座是方口的是正級，圓口的是負級。對應(yīng)電視機的蓮花頭外圈是負級，內(nèi)柱是正級。

具體如圖：

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?

?換個角度看一下：

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線做好之后，就可以直接跟電視機的AV信號口連接了，由于只有視頻信號，沒有接聲音，因此只要接電視機上的視頻信號口就可以了，一般是黃色。

在樹莓派上要進行一下配置才能輸出視頻。

配置文件位于 /boot/config.txt

核心配置：

sdtv_mode=2

另外，要把 hdmi_ignore_hotplug=1 前面加上#，給注釋掉，不要輸出HDMI

此外，如果你還通過raspi-config等設(shè)置了分辨率之類的，也把相關(guān)的配置注釋掉，例如

hdmi_group=2

hdmi_mode=82? ? ? ?

等等。。。如果你不太清楚這些配置的含義，查看一下文章最后的網(wǎng)頁。

要注意的是：HDMI好像不能和視頻信號同時輸出，所以在配置AV視頻信號輸出的時候，一定要把HDMI相關(guān)全部的內(nèi)容注釋掉。

這個我折騰了很久，還以為正負級接反了。

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總結(jié)

1、整體感覺顯示效果一般，顯示效果回到了FC游戲機年代

2、但是顯示簡單，兼容性好，連到老電視也能顯示

3、與HDMI不能同時輸出

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最終效果圖

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附件：列幾個配置文件里面video相關(guān)的內(nèi)容，供參考。

RPiconfig - eLinux.orghttps://elinux.org/RPiconfig

Video mode options

sdtv_mode?defines the TV standard for composite output (default=0)

sdtv_mode=0 Normal NTSC sdtv_mode=1 Japanese version of NTSC – no pedestal sdtv_mode=2 Normal PAL sdtv_mode=3 Brazilian version of PAL – 525/60 rather than 625/50, different subcarrier

sdtv_aspect?defines the aspect ratio for composite output (default=1)

sdtv_aspect=1 4:3 sdtv_aspect=2 14:9 sdtv_aspect=3 16:9

hdmi_safe?Use "safe mode" settings to try to boot with maximum hdmi compatibility. This is the same as the combination of: hdmi_force_hotplug=1, hdmi_ignore_edid=0xa5000080, config_hdmi_boost=4, hdmi_group=2, hdmi_mode=4, disable_overscan=0, overscan_left=24, overscan_right=24, overscan_top=24, overscan_bottom=24

hdmi_safe=1

hdmi_force_hotplug?Pretends HDMI hotplug signal is asserted so it appears a HDMI display is attached

hdmi_force_hotplug=1 Use HDMI mode even if no HDMI monitor is detected

hdmi_ignore_hotplug?Pretends HDMI hotplug signal is not asserted so it appears a HDMI display is not attached

hdmi_ignore_hotplug=1 Use composite mode even if HDMI monitor is detected

hdmi_mode?defines screen resolution in CEA or DMT format (for other modes not listed here have a look at?this thread)

These values are valid if hdmi_group=1 (CEA) hdmi_mode=1 VGA hdmi_mode=2 480p 60 Hz hdmi_mode=3 480p 60 Hz H hdmi_mode=4 720p 60 Hz hdmi_mode=5 1080i 60 Hz hdmi_mode=6 480i 60 Hz hdmi_mode=7 480i 60 Hz H hdmi_mode=8 240p 60 Hz hdmi_mode=9 240p 60 Hz H hdmi_mode=10 480i 60 Hz 4x hdmi_mode=11 480i 60 Hz 4x H hdmi_mode=12 240p 60 Hz 4x hdmi_mode=13 240p 60 Hz 4x H hdmi_mode=14 480p 60 Hz 2x hdmi_mode=15 480p 60 Hz 2x H hdmi_mode=16 1080p 60 Hz hdmi_mode=17 576p 50 Hz hdmi_mode=18 576p 50 Hz H hdmi_mode=19 720p 50 Hz hdmi_mode=20 1080i 50 Hz hdmi_mode=21 576i 50 Hz hdmi_mode=22 576i 50 Hz H hdmi_mode=23 288p 50 Hz hdmi_mode=24 288p 50 Hz H hdmi_mode=25 576i 50 Hz 4x hdmi_mode=26 576i 50 Hz 4x H hdmi_mode=27 288p 50 Hz 4x hdmi_mode=28 288p 50 Hz 4x H hdmi_mode=29 576p 50 Hz 2x hdmi_mode=30 576p 50 Hz 2x H hdmi_mode=31 1080p 50 Hz hdmi_mode=32 1080p 24 Hz hdmi_mode=33 1080p 25 Hz hdmi_mode=34 1080p 30 Hz hdmi_mode=35 480p 60 Hz 4x hdmi_mode=36 480p 60 Hz 4xH hdmi_mode=37 576p 50 Hz 4x hdmi_mode=38 576p 50 Hz 4x H hdmi_mode=39 1080i 50 Hz reduced blanking hdmi_mode=40 1080i 100 Hz hdmi_mode=41 720p 100 Hz hdmi_mode=42 576p 100 Hz hdmi_mode=43 576p 100 Hz H hdmi_mode=44 576i 100 Hz hdmi_mode=45 576i 100 Hz H hdmi_mode=46 1080i 120 Hz hdmi_mode=47 720p 120 Hz hdmi_mode=48 480p 120 Hz hdmi_mode=49 480p 120 Hz H hdmi_mode=50 480i 120 Hz hdmi_mode=51 480i 120 Hz H hdmi_mode=52 576p 200 Hz hdmi_mode=53 576p 200 Hz H hdmi_mode=54 576i 200 Hz hdmi_mode=55 576i 200 Hz H hdmi_mode=56 480p 240 Hz hdmi_mode=57 480p 240 Hz H hdmi_mode=58 480i 240 Hz hdmi_mode=59 480i 240 Hz H H means 16:9 variant (of a normally 4:3 mode). 2x means pixel doubled (that is, higher clock rate, with each pixel repeated twice) 4x means pixel quadrupled (that is, higher clock rate, with each pixel repeated four times) These values are valid if hdmi_group=2 (DMT) Note: according to Does RPi support resolution of 2560x1440? - Raspberry Pi Forums there is a pixel clock limit which means the highest supported mode is 1920x1200 @60?Hz with reduced blanking. hdmi_mode=1 640x350 85 Hz hdmi_mode=2 640x400 85 Hz hdmi_mode=3 720x400 85 Hz hdmi_mode=4 640x480 60 Hz hdmi_mode=5 640x480 72 Hz hdmi_mode=6 640x480 75 Hz hdmi_mode=7 640x480 85 Hz hdmi_mode=8 800x600 56 Hz hdmi_mode=9 800x600 60 Hz hdmi_mode=10 800x600 72 Hz hdmi_mode=11 800x600 75 Hz hdmi_mode=12 800x600 85 Hz hdmi_mode=13 800x600 120 Hz hdmi_mode=14 848x480 60 Hz hdmi_mode=15 1024x768 43 Hz DO NOT USE hdmi_mode=16 1024x768 60 Hz hdmi_mode=17 1024x768 70 Hz hdmi_mode=18 1024x768 75 Hz hdmi_mode=19 1024x768 85 Hz hdmi_mode=20 1024x768 120 Hz hdmi_mode=21 1152x864 75 Hz hdmi_mode=22 1280x768 Reduced blanking hdmi_mode=23 1280x768 60 Hz hdmi_mode=24 1280x768 75 Hz hdmi_mode=25 1280x768 85 Hz hdmi_mode=26 1280x768 120 Hz Reduced blanking hdmi_mode=27 1280x800 Reduced blanking hdmi_mode=28 1280x800 60 Hz hdmi_mode=29 1280x800 75 Hz hdmi_mode=30 1280x800 85 Hz hdmi_mode=31 1280x800 120 Hz Reduced blanking hdmi_mode=32 1280x960 60 Hz hdmi_mode=33 1280x960 85 Hz hdmi_mode=34 1280x960 120 Hz Reduced blanking hdmi_mode=35 1280x1024 60 Hz hdmi_mode=36 1280x1024 75 Hz hdmi_mode=37 1280x1024 85 Hz hdmi_mode=38 1280x1024 120 Hz Reduced blanking hdmi_mode=39 1360x768 60 Hz hdmi_mode=40 1360x768 120 Hz Reduced blanking hdmi_mode=41 1400x1050 Reduced blanking hdmi_mode=42 1400x1050 60 Hz hdmi_mode=43 1400x1050 75 Hz hdmi_mode=44 1400x1050 85 Hz hdmi_mode=45 1400x1050 120 Hz Reduced blanking hdmi_mode=46 1440x900 Reduced blanking hdmi_mode=47 1440x900 60 Hz hdmi_mode=48 1440x900 75 Hz hdmi_mode=49 1440x900 85 Hz hdmi_mode=50 1440x900 120 Hz Reduced blanking hdmi_mode=51 1600x1200 60 Hz hdmi_mode=52 1600x1200 65 Hz hdmi_mode=53 1600x1200 70 Hz hdmi_mode=54 1600x1200 75 Hz hdmi_mode=55 1600x1200 85 Hz hdmi_mode=56 1600x1200 120 Hz Reduced blanking hdmi_mode=57 1680x1050 Reduced blanking hdmi_mode=58 1680x1050 60 Hz hdmi_mode=59 1680x1050 75 Hz hdmi_mode=60 1680x1050 85 Hz hdmi_mode=61 1680x1050 120 Hz Reduced blanking hdmi_mode=62 1792x1344 60 Hz hdmi_mode=63 1792x1344 75 Hz hdmi_mode=64 1792x1344 120 Hz Reduced blanking hdmi_mode=65 1856x1392 60 Hz hdmi_mode=66 1856x1392 75 Hz hdmi_mode=67 1856x1392 120 Hz Reduced blanking hdmi_mode=68 1920x1200 Reduced blanking hdmi_mode=69 1920x1200 60 Hz hdmi_mode=70 1920x1200 75 Hz hdmi_mode=71 1920x1200 85 Hz hdmi_mode=72 1920x1200 120 Hz Reduced blanking hdmi_mode=73 1920x1440 60 Hz hdmi_mode=74 1920x1440 75 Hz hdmi_mode=75 1920x1440 120 Hz Reduced blanking hdmi_mode=76 2560x1600 Reduced blanking hdmi_mode=77 2560x1600 60 Hz hdmi_mode=78 2560x1600 75 Hz hdmi_mode=79 2560x1600 85 Hz hdmi_mode=80 2560x1600 120 Hz Reduced blanking hdmi_mode=81 1366x768 60 Hz hdmi_mode=82 1080p 60 Hz hdmi_mode=83 1600x900 Reduced blanking hdmi_mode=84 2048x1152 Reduced blanking hdmi_mode=85 720p 60 Hz hdmi_mode=86 1366x768 Reduced blanking

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